暂时去小查询引擎的流式输出功能，因为此模式下获取不到原

backend/app/engine/engine.py

@@ -81,7 +81,7 @@ def create_summary_query_engine(index, top_k=3, use_reranker=False, filters=None
     summary_query_engine = summary_index.as_query_engine(
     response_mode=ResponseMode.TREE_SUMMARIZE,
     use_async=True,
-    streaming=True,
+    streaming=False,
     )
     return summary_query_engine